Favorite 3rd Generation Game?

Emerald, followed closely by Leaf Green.

If I got Emerald, I would say that, but since I didn't, I'm going with Sapphire.

Emerald by far. Next would be probably R/S and FR/LG tied with each other for second. I can't really say anything for the others though: they're just spinoffs.

I just picked all the ones I have. The main series games're all great. Emerald would be a favorite, except it may be the hardest Pokémon game I've ever played. I had Ruby and FireRed, the first brought amazing graphics and new Pokémon, the latter was a remake that filled what the first didn't have (can't catch'em all if they're not all there). XD was far better than Coliseum, and Lugia was a great (re)addition to the series.

Ruby, Ranger, Trozei, PMD.

I like Ruby more than Emerald. XD

Emerald and PMD are pretty much tied. I love Emerald's expansion of Hoenn, especially that ownsome Battle Frontier. Pokemon Mystery Dungeon started my love of that spinoff series.

I really don't like Trozei, though. I got that game really cheap at GameStop (it was used), and at first, I was happy because I thought it would be fun. But after a while of playing, I started to see why the original owner returned it; I got very bored.

Emerald and LeafGreen are tied. Hoen was as beutiful as ever the battle frontier was fun, and the little bits of green were just the icing on the cake. I like green.

On the other hand The sevii Islands were incredibly fun to explore.

Saphire
my first Gen 3 game, i was just walking around like "oh my god this is just so awsome" Fortree was my favorite, but the whole region was just so amazing
I beat the twins and had no idea where to go from there, so i gave it to a freind to get me to Wallace. He lost it. so theres allways been this feeling of "What coulda been...." that made it seem so much more epic

XD, in my opinion, is an incredibly underrated game. It was better than Colosseum in virtually every way, and included one of the toughest In-Game battle challenges in the entire series in the form of the Orre Colosseum. I wouldn't say it was my favorite Gen. III game, not when I've poured my heart and soul into Sapphire, but I loved it nonetheless.

Probably a cross between Leaf Green, Emerald and Colosseum. They all have their merits. (I know it sounds like a cop-out. If I was forced to pick at gunpoint, I'd probably say Emerald.)

Never played XD, so I can't vouch for or against it, but it looks like it was cool.

Emerald for sure, though FRLG is fun too. Im replaying both right now, and it's just as fun as when I played it the first time.

Emerald and FireRed. I've played them and the other games, and they just give me more experience.

I loved Emerald and Leaf Green.

Um...Ranger or PMD.
I prefer Gen III PMD cause my Venusaur could actually destroy walls. My Torterra cannot.
I prefer Gen IV Ranger, though.

I actually had every main series gen 3 game hehe. It went Ruby(first poke game)-Sapphire-FireRed-Emerald-LeafGreen